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Old 06-19-2014, 10:36 AM
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Default Threading vs Cutting Oil (paging Shade)

I had some great stuff.... friend left me a gallon of machining oil some years back, and I've finally depleted it. I'm sure nasty sulfur and chlorine stuff, sigh lost him to cancer... maybe this is not that good to be around.

I bought Mobil 766. Threading, drilling, milling steel (4130, 4140, 8620).

Well normally I drill 0.500" deep (1/4" in this case, 1000 rpm, 0.006" per rev). Simple, drill, then peck every 0.250" after that.... 1.3" deep (lots of room for blind tapping 1" deep). 8620.

Seized and broke a drill bit. Grrrrrrr....... Just wondering if I'm asking too much of this new oil.
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Old 06-19-2014, 11:07 AM
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I presume you're doing this manually? If so, any decent cutting oil should be sufficient. I'd try backing off on the speed and feed a bit. For really tough drilling situations I've had good luck with Tap Magic Xtra-Thick. It's a bit pricey but it sure seems to work good...
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Old 06-19-2014, 11:11 AM
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Originally Posted by Roundrocktom View Post
I had some great stuff.... friend left me a gallon of machining oil some years back, and I've finally depleted it. I'm sure nasty sulfur and chlorine stuff, sigh lost him to cancer... maybe this is not that good to be around.

.
I sure as hell hope not, as I use it constantly, not only to drill and tap, but to thread pipe.
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Old 06-19-2014, 11:29 AM
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Mobilcut Omega might work, I am working on other options.
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Old 06-19-2014, 11:31 AM
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Chlorine is a big help for manual operations. Everyone is going chlorine free...
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Old 06-19-2014, 11:41 AM
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Chlorine is a big help for manual operations. Everyone is going chlorine free...
I just scrubbed the shower this morning and used Soft Scrub with Chlorox. I've always found bleach to leave my hands all nice and white and slippery.
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Old 06-19-2014, 11:58 AM
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Originally Posted by platypus20 View Post
I sure as hell hope not, as I use it constantly, not only to drill and tap, but to thread pipe.
Isn't chlorine made in Syracuse....?
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Old 06-19-2014, 12:03 PM
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I just scrubbed the shower this morning and used Soft Scrub with Chlorox. I've always found bleach to leave my hands all nice and white and slippery.


Dick, Dick, Dick,

Please!! What you do in the shower is your business!! TMI, TMI, TMI

Sometimes the best things are unsaid..............................
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Last edited by platypus20; 06-19-2014 at 01:56 PM.
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Old 06-19-2014, 12:49 PM
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...Something the best things are unsaid..............................
Tee hee....
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Old 06-19-2014, 02:55 PM
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I do appreciate the chuckle on this one.

Power Feed was being used, hence 0.006" per rev. Drill bit was nice and sharp (two tight curls coming up). Spot drill to locate hole I'd dab oil with acid brush. This is my Index 555 Milling machine. Damn fine mill, does what it is told, only error the operator at the levers.

Engage drill, go 700 down push oil into the hole with the brush. Release, another 300, release, another 300. Normally I can hear the crunch, and release feed before any damage. So 1.3" depth (I'll tap 1" -- blind holes, so I like the chip pocket as I'll power tap).

Old oil would just say "give me more". New stuff is horrible.

I was running 1000 rpm. Conservative, Feed was 0.006" per rev (aggressive).

With the depth, it is a full circle and half (rotator cuff make that difficult, fine for a few times, but with multi passing.... about 300 repeats). Lots of drilling, some preream, followed by reaming. 1/4" and 3/8" mix. Speeds are belt adjusted with two speed motor (typically I use 500 and 1000 rpm).
(for tapping, I do change belt speed to slow!)

8620 isn't difficult to machine (4340 I'd drop feed to 0.003" per rev).

Biggest change... that damn oil!
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